How many sigma and pi bonds are in the molecule ch3chch2? 1. 6 sigma and 2 pi 2. 2 sigma and 1 pi 3. 9 sigma and 0 pi 4. 8 sigma and 1 pi 5. 7 sigma and 2 pi 6. 7 sigma and 1 pi?

The molecule is as follows;

H₃C---C==CH₂

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H

- - - represents single bonds whilst = = represents double bonds

Single bonds are formed by sigma orbital head on overlap between sigma orbitals of C and H in the case of C-H bonds and between C sigma orbitals in the case of C-C bonds

the number of sigma bonds are therefore the number of single bonds which are:

6 C-H bonds

2 C-C bonds

altogether 8 sigma bonds

p orbitals side - on overlap forms a pi bond. In double bonds, there's one sigma bond and one pi bond.

number of double bonds - 1 C=C therefore one pi bond

Answer is 4) 8 sigma and 1 pi